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AudioControl designed the EQS for one reason  to make your car audio system sound better. This rugged 6-channel equalizer features 13 bands of adjustment for sonic fine tuning, along with a line driver that allows you to send the cleanest possible signal to your amplifiers. And speaker-level inputs allow you to connect the EQS to just about any car stereo, even Bose® systems and factory amps up to 400 watts.

The EQS features inputs and outputs for your front, rear, and subwoofer channels, fitting between your receiver and your amplifiers in the signal chain. Once connected, the EQS makes it easy  turn up the input gain knobs, adjust the output knobs until the light indicates the desired output, and you're all set. You can adjust the output level up to 9.5 volts, so you can maximize the performance of any amplifier.

Most car audio problems occur in the bass frequencies, so the subwoofer channel gives you six bands of equalization between 31.5 and 100 Hz, along with a rolloff filter that keeps inaudible subsonic bass out of your subwoofer system. You also get seven bands of equalization from 120 Hz all the way up to 10,000 Hz on the front and rear channels. If you're not using the sub channel, the low-frequency EQ section switches to the rear channel automatically.

The EQS is designed to work with a variety of systems, whether it's tied directly into a single amp or connected to an AudioControl crossover in a multi-amp setup. Check out the system diagrams in More Photos.

Line Driver: To achieve the
best possible signal to noise ratio and dynamic range from your amplifier, the
built-in line driver can increase the head unit's output voltage up to 18 dB (9.5 volts RMS/13 volts peak).

Input Gain: The input gains for the front, rear, and sub channels
are set independently. The range is adjustable +/-12 dB to match the source
output to the EQ input.

Output Level: The +20 dB maximum output level allows you to increase the
head unit's line voltage to the top of your amp's input range; up to 9.5 volts RMS/13 volts peak.

Balanced Inputs: Using the balanced differential input circuit cancels
noise picked up in the transmission line between the EQS the the source
unit.

Ground Isolation: The power supply ground is switchable, in case of
ground loop noise. The factory position is fully isolated (typically the best
choice), but can be changed to Ground or 200Ω.

Auto Select Inputs: The EQS
automatically switches the inputs to maximize the equalization controls, whether
you use two, four, or six preamp inputs.

Speaker Level Inputs: The
4-channel speaker level inputs are compatible with most factory installed
radios, even most Bose systems.

Terminal Blocks: The power/ground/remote terminal and the
speaker level input terminals are removable; the wiring is attached to the
block, then the block is plugged into the EQS. The terminal block will
accommodate wire up to 12 gauge.

Subsonic Filter: The subsonic filter crossover point is 33
Hz. The crossover point is governed by a replaceable chip, so it can be
modified.

Specifications:

Maximum Line Input: 15
volts RMS

Maximum Speaker Level Input:
100 watts/channel

Maximum Output: 9.5 volts RMS/13 volts peak

Frequency response: 10 Hz-100 kHz; ±1 dB

THD: 0.003%

S/N Ratio: 110dB

Balanced Input Noise Rejection: 60 dB

Input Impedance: 20 kΩ

Output Impedance: 150 ohms

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5202905555

Written By The Dude, Phoenix, AZ on Sunday, September 08, 2013

This item is a must for those with discerning taste when it comes to thier auto audio system.

A must have!

I have a 2013 Toyota Avalon and wanted to upgrade my audio system without replacing the factory head unit. I installed a JL Audio cleansweep dsp and matched that up with the EQS. What a nice combination. I used a JL Audio Slash 300/4 v3 for my front and rears and a xd 600/1 for my sub (tw5v2). Between the output voltage boost and the equalizer functions, the EQS gave me the ability to modify my sound the way I had envisioned.

Pretty good

Written By ernie, San Pedro, CA on Sunday, November 04, 2012

I've been using the EQS for 2 years now and It has been very reliable. For what this unit does, it does very well and I have no complaints. If you are like me and don't want to spend a ton on an expensive DSP this is a very good compromise. The line driver on this plus EQ is really worth the price you pay, the signal is very strong and very clean. EQS makes it dummy proof to set this up and get going, especially with the clipping lights. To sum it up if your looking for some eq on a budget and don't want to get a DSP (Digital Signal Processor) than this is the next best thing. Pros: Build quality and sound plenty of bands for adjustment small form factor Cons: none for me

Perfect for factory head units

Nice unit with lots of equalization and tuning options. I was running speaker level inputs so this was perfect to clean up the signal. I had never heard of them so my trust in the Crutchfield advisor was how I based my decision.

Pros:Lots of signal processing options. You can get a really nice sound from the factory head unit with this processor.

Cons:It takes a bit of tinkering to get the sound right and any bugs out of it. I had a whine which I was able to phase out by lowering the amp gains to their lowest setting and adjusting the input and output on the processor. The manual said to start by setting the volume to 3/4, but I set it at about half way up then connected everything and cranked it up. Then I set my equalizer settings, & I have not touched it since. It did take about a week of listening to set it to where I have it now,